Limit on the tau neutrino mass fromτ−→π−π+π−π0ντ
نویسندگان
چکیده
منابع مشابه
Upper limit on the tau-neutrino mass.
S. Abachi, C. Akerlof, P. Baringer, I. Beltrami, t'~ D. Blockus, G. Bonvicini, B. Brabson, B. G. Bylsma, J. Chapman, B. Cork, R. DeBonte, M. Derrick, D. Errede, K. K. Gan, S. W. Gray, tb~ N. Harnew, t'~ C. Jung, P. Kesten, td~ D. Koltick, P. Kooijman, F. J. Loeffler, J. S. Loos, E. H. Low, R. L. McIlwain, D. I. Meyer, D. H. Miller, B. Musgrave, H. Neal, D. Nitz, C. R. Ng, H. Ogren, L. E. Price,...
متن کاملAn improved cosmological bound on the tau-neutrino mass
We consider the influence of non-equilibrium electronic neutrinos (and anti-neutrinos) on the neutron-to-proton ratio. These neutrinos would come from massive ντ annihilations ν̄τντ → ν̄eνe. For sufficiently large ντ masses this new effect would strongly enhance the (n/p)-ratio, leading to a very stringent bound on the ντ mass, even adopting a rather weak upper bound on the effective number on ne...
متن کاملNew Limits on Tau Neutrino Mass from CLEO II
I report on two studies of tau neutrino mass recently carried out using data collected with the CLEO II detector at the CESR ee collider. First I present the results of an analysis of 473 decays of the type ! 5 and ! 3 2 , from which a 95% CL upper limit on m of 30 MeV is obtained. Results are also presented from a preliminary analysis of the decay ! 3 , using a sample of 29; 000 reconstructed ...
متن کاملConstraints on the tau neutrino mass and mixing from precise measurements of tau decay rates
We have derived constraints on the tau neutrino mass and fourth generation mixing from an analysis of the partial widths of tau lepton decays, in particular: τ−→ e−ν̄eντ , τ −→μ−ν̄μντ , τ →π −ντ , and τ →K −ντ . We present predictions for the tau decay widths, allowing for a non-zero tau neutrino mass, mντ , and for mixing with a neutrino of mass mνL > MZ/2, which is parametrised using a Cabibbo-...
متن کاملLepton flavor violation and the tau neutrino mass.
We point out that, in the left-right symmetric model of weak interactions, if ντ mass is in the keV to MeV range, there is a strong correlation between rare decays such as τ → 3μ, τ → 3e and the ντ mass. In particular, we point out that a large range of ντ masses are forbidden by the cosmological constraints on mντ in combination with the present upper limits on these processes. † Work supporte...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2000
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.61.052002